Uncountable nouns do not take “a/an”
Incorrect : He has found a work at the bank.
Correct : He has found work at the bank.
Incorrect: We had a fun on the boat.
Correct: We had fun on the boat.
Incorrect : She enjoys a good health.
Correct : She enjoys good health.
Note: “Work', 'fun', 'health' etc are uncountable nouns. An uncountable noun does not take 'a' or 'an' or “one' before it. You can, however, use partitives before an uncountable noun. For example:
We had a lot of fun on the boat.
The word "work” can also be countable. For example:
It's an excellent work of art.
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